How can we connect the max30101 from the \ncs\zephyr\samples\sensor\max30101 .. i added the links to a blinky and it compiles successfully but can't seem to get the i2c working .. please help

[Norad308]

Main in green

/*
* Copyright (c) 2016 Intel Corporation
*
* SPDX-License-Identifier: Apache-2.0
*/

#include <zephyr.h>
#include <device.h>
#include <gpio.h>
#include <misc/printk.h>
#include <stdio.h>
#include <string.h>
#include <sensor.h>

#define LED_PORT LED0_GPIO_CONTROLLER
#define LED LED1_GPIO_PIN

/* 1000 msec = 1 sec */
#define SLEEP_TIME 1000

void main(void)
{

printk("UART loopback start!\n");

int cnt = 0;
//struct device *dev;

//dev = device_get_binding(LED_PORT);
/* Set LED pin as output */
//gpio_pin_configure(dev, LED, GPIO_DIR_OUT);

struct sensor_value green;
struct device *dev = device_get_binding("MAX30101");

if (dev == NULL) {
printk("Could not get max30101 device\n");
return;
}

while (1) {
/* Set pin to HIGH/LOW every 1 second */
sensor_sample_fetch(dev);
sensor_channel_get(dev, SENSOR_CHAN_GREEN, &green);
/* Print green LED data*/
printk("GREEN=%d\n", green.val1);
k_sleep(20);
//gpio_pin_write(dev, LED, cnt % 2);
printk("Hello World! %s\n", CONFIG_BOARD);
cnt++;
k_sleep(SLEEP_TIME);
}
}

CONF FILE in red

CONFIG_GPIO=y
CONFIG_SERIAL=y
CONFIG_I2C=y
CONFIG_I2C_NRFX=y
CONFIG_I2C_1=y
CONFIG_I2C_1_NRF_TWIM=y
CONFIG_SENSOR=y
CONFIG_LOG=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_AT_HOST_LIBRARY=y
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SENSOR_LOG_LEVEL_DBG=y
CONFIG_MAX30101=y

[Gurkan]

you need to define the sensor in overlay as well

&i2c2 {
  max30101@57 {
    compatible = "max,max30101";
    reg = <0x57>;
    label = "MAX30101";
    irq-gpios = <&gpio0 20 0>;
  };
};

[Norad308]

&i2c1 {
status = "ok";
sda-pin = <10>;
scl-pin = <11>;
clock-frequency = <100000>; 
};

&i2c1 {
  max30101@57 {
    compatible = "max,max30101";
    reg = <0x57>;
    label = "MAX30101";
    irq-gpios = <&gpio0 20 0>;
  };
};

Is this topology correct?

Can you share a guide for the overlay files regarding i2c 

Thanks

[Gurkan]

Not sure if there is a guide for that. I've figured it out while looking at the files under zephyr folder;

"zephyr/dts/bindings" folder has the template files that will give you an idea about what parameters you can put in overlay file

i think in your case it should be like

&i2c1 {
status = "ok";
sda-pin = <10>;
scl-pin = <11>;
clock-frequency = <100000>; 
  max30101@57 {
    compatible = "max,max30101";
    reg = <0x57>;
    label = "MAX30101";
    irq-gpios = <&gpio0 20 0>;
  };
};

[Norad308]

Thank you 

I'm getting this error while compilation when it reaches nrfx.twim.c

'NRF_TWIM1' undeclared (first use in this function); did you mean 'NRF_TWIM2'?

Thats the prj.conf 

CONFIG_GPIO=y
CONFIG_SERIAL=y
CONFIG_I2C=y
CONFIG_I2C_NRFX=y
CONFIG_I2C_1=y
CONFIG_I2C_1_NRF_TWIM=y
CONFIG_SENSOR=y
CONFIG_LOG=y
CONFIG_TRUSTED_EXECUTION_NONSECURE=y
CONFIG_UART_INTERRUPT_DRIVEN=y
CONFIG_AT_HOST_LIBRARY=y
CONFIG_MAIN_STACK_SIZE=4096
CONFIG_SENSOR_LOG_LEVEL_DBG=y
CONFIG_MAX30101=y

And the main

/*
 * Copyright (c) 2016 Intel Corporation
 *
 * SPDX-License-Identifier: Apache-2.0
 */

#include <zephyr.h>
#include <device.h>
#include <gpio.h>
#include <misc/printk.h>
#include <stdio.h>
#include <string.h>
#include <sensor.h>



#define LED_PORT LED0_GPIO_CONTROLLER
#define LED	LED1_GPIO_PIN

/* 1000 msec = 1 sec */
#define SLEEP_TIME 	1000





void main(void)
{

       
	printk("UART loopback start!\n");

	int cnt = 0;
	//struct device *dev;

	//dev = device_get_binding(LED_PORT);
	/* Set LED pin as output */
	//gpio_pin_configure(dev, LED, GPIO_DIR_OUT);


        struct sensor_value green;
        struct device *dev = device_get_binding("MAX30101");

	if (dev == NULL) {
		printk("Could not get max30101 device\n");
		return;
	}

	while (1) {
		/* Set pin to HIGH/LOW every 1 second */
                sensor_sample_fetch(dev);
		sensor_channel_get(dev, SENSOR_CHAN_GREEN, &green);
		/* Print green LED data*/
		printk("GREEN=%d\n", green.val1);
		k_sleep(20);
		//gpio_pin_write(dev, LED, cnt % 2);
                printk("Hello World! %s\n", CONFIG_BOARD);
		cnt++;
		k_sleep(SLEEP_TIME);
	}
}

 

[Simon]

Try to do the following:

• Copy the folder max30101 (<..>ncs\zephyr\samples\sensor\) into your working folder (e.g. <..>ncs\nrf\samples\nrf9160)
• Don't modify any of the files, let the prj.conf and main.c be as it is
• Create a file named nrf9160_pca10090ns.overlay inside the max30101 folder, and add the following inside it:

&i2c2 {	
	max30101@57 {
		compatible = "max,max30101";
		reg = <0x57>;
		label = "MAX30101";
	};
};

This extends on the enabled i2c2 device tree node from <..>\ncs\zephyr\boards\arm\nrf9160_pca10090\nrf9160_pca10090_common.dts

• Build the example with the board set as nrf9160_pca10090ns (or whatever you chose for the overlay file)
• Connect the max30101 using the SDA and SCL pins as defined in the i2c2 device tree node from <..>\ncs\zephyr\boards\arm\nrf9160_pca10090\nrf9160_pca10090_common.dts (If you haven overwritten it in the overlay file).

Best regards,

Simon

[Norad308]

THANK YOU VERY MUCH !!! IT WORKED